New project category in VS 2010 not appearing

I am not able to create my own new project category in Visual Studio 2010. I was able to add new for Item templates but not for project template.

I have created a folder "ABC" in "C:\Users\xyz\Documents\Visual Studio 2010\Templates\ProjectTemplates\Visual C#\ABC

and then I have exported my custom project template .zip file here in this folder. But I don't see the category being add when I try to create new project. 

This worked once but after I delete all the .zip files from this folder, the new project category stopped appearing. I followed the steps mentioned in this website: 

http://visualstudiomagazine.com/Articles/2012/08/20/Visual-Studio-custom-templates.aspx?Page=2

Any help would be appreciated.